Multiple choice

Find the missing term in the following number series: $100\ \ 140\ \ 197\ \ 273\ \ 370\ \ ?$

  1. $495$
  2. $490$
  3. $475$
  4. $460$
  5. $512$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The differences between consecutive terms follow a pattern: 140-100=40, 197-140=57, 273-197=76, 370-273=97. The second-level differences are 57-40=17, 76-57=19, 97-76=21, increasing by 2 each time. The next second-level difference should be 23, so the next first-level difference is 97+23=120. Therefore, 370+120=490, which is option B.

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